Method and system for establishing a power feed to systems during operation

A data center comprising:

• a plurality of rack computer systems;
• a power distribution unit configured to distribute power to at least a portion of the rack computer systems;
• a donor power source;
• and
• a back feed control unit configured to:
• couple with the donor power source to receive electrical power from the donor power source;
• couple with an outlet receptacle of the power distribution unit via a back feed cable;
• and
• back feed power from the donor power source to the at least a portion of the rack computer systems via the back feed cable coupled to the outlet receptacle of the power distribution unit.

A facility comprising:

• a plurality of primary power systems, each comprising:
• a floor power distribution unit (floor PDU);
• and
• one or more downstream power distribution units (downstream PDUs),
• wherein the primary power systems are configured such that the one or more downstream PDUs of a respective primary power system receive power distributed from the floor PDU of the respective primary power system,
• wherein the floor PDUs of at least some of the primary power systems distribute power having a different phase than power distributed from floor PDUs of other ones of the primary power systems;
• and
• a back feed control unit configured to:
• couple with a floor PDU of one of the primary power systems to receive donor power from the floor PDU;
• couple with an outlet receptacle of a downstream PDU of another one of the primary power systems via a back feed cable;
• and
• back feed donor power from the floor PDU of the primary power system to downstream PDU of the other primary power system.